linux-kernel - Re: [PATCH v2] mips: sgi-ip27: switch from DISCONTIGMEM to SPARSEMEM

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Date:   Wed, 2 Oct 2019 10:02:29 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Paul Burton <paul.burton@...s.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Thomas Bogendoerfer <tbogendoerfer@...e.de>
Subject: Re: [PATCH v2] mips: sgi-ip27: switch from DISCONTIGMEM to SPARSEMEM

Hi,

Any updates on this?

On Mon, Sep 16, 2019 at 02:13:10PM +0300, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> The memory initialization of SGI-IP27 is already half-way to support
> SPARSEMEM. It only had free_bootmem_with_active_regions() left-overs
> interfering with sparse_memory_present_with_active_regions().
> 
> Replace these calls with simpler memblocks_present() call in prom_meminit()
> and adjust arch/mips/Kconfig to enable SPARSEMEM and SPARSEMEM_EXTREME for
> SGI-IP27.
> 
> Co-developed-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
> 
> v2: don't add extra sparse_init() and use memblocks_present() instead of
> sparse_memory_present_with_active_regions()
> 
>  arch/mips/Kconfig                | 12 ++----------
>  arch/mips/sgi-ip27/ip27-memory.c |  6 ++----
>  2 files changed, 4 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index d50fafd..e4b02b5 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -669,6 +669,7 @@ config SGI_IP22
>  config SGI_IP27
>  	bool "SGI IP27 (Origin200/2000)"
>  	select ARCH_HAS_PHYS_TO_DMA
> +	select ARCH_SPARSEMEM_ENABLE
>  	select FW_ARC
>  	select FW_ARC64
>  	select BOOT_ELF64
> @@ -2633,18 +2634,9 @@ config ARCH_FLATMEM_ENABLE
>  	def_bool y
>  	depends on !NUMA && !CPU_LOONGSON2
>  
> -config ARCH_DISCONTIGMEM_ENABLE
> -	bool
> -	default y if SGI_IP27
> -	help
> -	  Say Y to support efficient handling of discontiguous physical memory,
> -	  for architectures which are either NUMA (Non-Uniform Memory Access)
> -	  or have huge holes in the physical address space for other reasons.
> -	  See <file:Documentation/vm/numa.rst> for more.
> -
>  config ARCH_SPARSEMEM_ENABLE
>  	bool
> -	select SPARSEMEM_STATIC
> +	select SPARSEMEM_STATIC if !SGI_IP27
>  
>  config NUMA
>  	bool "NUMA Support"
> diff --git a/arch/mips/sgi-ip27/ip27-memory.c b/arch/mips/sgi-ip27/ip27-memory.c
> index fb077a9..9db8692 100644
> --- a/arch/mips/sgi-ip27/ip27-memory.c
> +++ b/arch/mips/sgi-ip27/ip27-memory.c
> @@ -406,12 +406,8 @@ static void __init node_mem_init(cnodeid_t node)
>  	slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
>  			       sizeof(struct hub_data));
>  
> -	free_bootmem_with_active_regions(node, end_pfn);
> -
>  	memblock_reserve(slot_firstpfn << PAGE_SHIFT,
>  			 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
> -
> -	sparse_memory_present_with_active_regions(node);
>  }
>  
>  /*
> @@ -444,6 +440,8 @@ void __init prom_meminit(void)
>  		}
>  		__node_data[node] = &null_node;
>  	}
> +
> +	memblocks_present();
>  }
>  
>  void __init prom_free_prom_memory(void)
> -- 
> 2.7.4
> 

-- 
Sincerely yours,
Mike.